By default oracle saves cards.xml to the correct path, where cockatrice
will be able to pick it up;
if oracle is not able to determine the path or the user unchecks the
option, oracle will ask for a save path

* add multiverse id to cards.xml
* remove pictures urls from cards.xml
TBD:
* fix/clean oracle’s gui
* add support in cockatrice

Problem: Split card are imported as 2 different cards; need to find
some way to join them

Problem: Split card are imported as 2 different cards; need to find
some way to join them

* Remove cockatrice_HEADERS (obsoleted by automoc)
* Remove compilation flags definition and Qt4 finding calls
* Make use of CMAKE_INSTALL_PREFIX
* use INSTALL(TARGETS) in place of INSTALL(PROGRAM)
* Osx: create a proper application bundle
* Added comments

Use QDesktopServices::StandardLocation for platform independent default paths that don't touch the application's own folder

Added to CardInfo object and to the oracle importer. Next step is the
card info widget.